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Graphene-modified water-based zinc-aluminum anticorrosion coating solution and preparation method thereof

A graphene modification and graphene technology, applied in the field of metal anti-corrosion coatings, can solve the problems of harsh production environment, limited service temperature, low surface hardness, etc., and achieve the effects of appropriate structural strength, improved consistency, and appropriate bonding degree

Active Publication Date: 2021-07-20
宁波知源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anti-corrosion coating is an effective means to avoid corrosion of metal products. At present, most of the paints used for metal anti-rust decoration contain organic solvents. Thinners are added during construction, which are flammable and poisonous, and have serious environmental pollution. very strict requirements
The traditional electro-galvanizing and hot-dip galvanizing processes have great limitations due to poor corrosion resistance, environmental protection, hydrogen embrittlement, and limited operating temperature.
[0003] Zinc-chromium coating (Dacromet coating) technology is a new metal surface anti-corrosion technology developed in recent years. The biggest advantage of Dacromet coating is that it has excellent corrosion resistance. The coating has no hydrogen embrittlement, especially It is suitable for high-strength stress-bearing parts; the coating has high heat resistance and heat resistance temperature above 400°C, but Dacromet coating also has a series of shortcomings such as low surface hardness, and Dacromet coating is not completely pollution-free For coatings, chromate is used in the Dacromet treatment solution as a passivator and binder in the film formation process, so the treatment solution contains Cr 6+
Cr 6+ It is highly toxic and has carcinogenic effects on the human body. European and American countries have introduced regulations to strictly limit the content of chromium in Dacromet coating. In this context, chromium-free zinc-aluminum coating technology came into being. However, the common water-based chromium-free zinc-aluminum coatings on the market have poor anti-corrosion performance, and high-end coatings are expensive, and the cost of use is correspondingly increased; there are also other film-forming agents such as resins, which are oily. Coatings, the production environment is harsh, and the promotion and use are limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix fillers: phosphate, molybdate and tungstate with graphene (the number of layers is about 10 layers) evenly, ball mill for 2 hours, the speed of the ball mill is 300 rpm, after ball milling, put the sample into the sintering furnace for sintering For 4 hours, the sintering temperature is 300°C, and the sintering atmosphere is nitrogen. After adding a certain amount of film-forming agent to the sintered sample, put it into a ball mill and mill it for 8 hours. The speed of the ball mill is 300 rpm. Zinc powder, aluminum After the powder, solvent and additives are fully mixed with the prepared sample according to the proportion, the thickener is added and stirred to obtain the anti-corrosion coating. Among them, zinc powder (thickness 0.35 μm, diameter 15 μm) 30%, aluminum powder (thickness 35 μm, diameter 10 μm) 5%, film-forming agent 20%, solvent (volume ratio water:polyethylene glycol 400=10:1) 40%, additive 0.5%, thickener 0.3%, graphene 0.2% and filler 4.5%, the ra...

Embodiment 2

[0022] Mix fillers: phosphate, molybdate and tungstate with graphene (the number of layers is about 20 layers) evenly, ball mill for 5 hours, the ball mill speed is 500 rpm, after ball milling, put the sample into the sintering furnace for sintering For 4 hours, the sintering temperature is 300°C, and the sintering atmosphere is nitrogen. After adding a certain amount of film-forming agent to the sintered sample, put it into a ball mill and mill it for 10 hours. The speed of the ball mill is 500 rpm. Zinc powder, aluminum After the powder, solvent and additives are fully mixed with the prepared sample according to the proportion, the thickener is added and stirred to obtain the anti-corrosion coating. Among them, zinc powder (thickness 0.25 μm, diameter 15 μm) 25%, aluminum powder (thickness 0.35 μm, diameter 20 μm) 10%, film-forming agent 15%, solvent (volume ratio water: polyethylene glycol 800 = 10:1 ) 45%, additives 0.5%, thickener 0.3%, graphene 0.2% and filler 4.5%, the ...

Embodiment 3

[0024] Mix fillers: phosphate, molybdate and tungstate with graphene (graphene oxide containing hydroxyl) evenly, ball mill for 20 hours, the ball mill rotates at 600 rpm, after ball milling, put the sample into a sintering furnace for sintering For 4 hours, the sintering temperature is 300°C, and the sintering atmosphere is argon. After adding a certain amount of film-forming agent to the sintered sample, put it into a ball mill and mill it for 10 hours. The speed of the ball mill is 600 rpm. Zinc powder, After the aluminum powder, solvent and additives are fully mixed with the prepared sample according to the proportion, the thickener is added and stirred to obtain the anti-corrosion coating. Among them, zinc powder (thickness 0.15 μm, diameter 20 μm) 30%, aluminum powder (thickness 0.35 μm, diameter 5 μm) 3%, film-forming agent 20%, solvent (volume ratio water: polyethylene glycol 400 = 10:1 ) 40%, additives 0.5%, thickener 0.3%, graphene 0.2% and filler 6%, the ratio of mo...

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Abstract

The invention discloses a graphene-modified water-based zinc-aluminum anti-corrosion coating solution. The preparation raw materials include the following components in terms of weight percentage: 10-30% of zinc, 1-10% of aluminum, 2-30% of film-forming agent, and solvent 40-70%, additives 0.1-10%, thickener 0.1-5%, graphene 0.001-15%, filler 0.1-10%. The compatibility of each component in the graphene-modified water-based zinc-aluminum anti-corrosion coating liquid of the present invention is reasonable, the property of the anti-corrosion coating liquid is stable, the coating formed after coating has good compactness and good anti-corrosion performance. 0.1-10% filler is bonded by premixing and sintering, and 0.001-15% graphene is used as a conductive substance to cover the surface of 0.1-10% filler, which improves the consistency and uniformity of the zinc-aluminum coating, and helps the entire coating slow down. The establishment of corrosion network; in the preparation process, the raw materials are premixed twice to obtain a premixed material with suitable particle size and microstructure. When mixed with the remaining raw materials, a coating solution with stable liquid properties can be obtained, and the components of the coating solution will not segregate, thus ensuring The cured coating has excellent anti-corrosion properties.

Description

technical field [0001] The invention relates to a metal anti-corrosion coating, in particular to a water-based zinc-aluminum anti-corrosion coating liquid, in particular to a graphene-modified water-based zinc-aluminum anti-corrosion coating liquid. Background technique [0002] Corrosion of metals is very common, and the loss to the national economy is very huge. Anti-corrosion coating is an effective means to avoid corrosion of metal products. At present, most of the paints used for metal anti-rust decoration contain organic solvents. Thinners are added during construction, which are flammable and poisonous, and have serious environmental pollution. The requirements are also very strict. The traditional electro-galvanizing and hot-dip galvanizing processes have great limitations due to their poor corrosion resistance, non-environmental protection, hydrogen embrittlement, and limited operating temperature. [0003] Zinc-chromium coating (Dacromet coating) technology is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00
CPCC04B30/00C04B2111/00482C04B22/04C04B24/32C04B24/383C04B22/16C04B22/08C04B14/024C04B24/26C04B2103/0068
Inventor 付正伟唐长林
Owner 宁波知源新材料有限公司
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